Infrared thermal imaging to detect heat loss and hidden defects
Heat loss rarely stays hidden for long. Our thermal imaging specialists carry out detailed infrared surveys across Woking, from Church Street East in GU21 6HJ to the newer homes around Allium Park in GU23 6HB. Thermal cameras read surface temperature variations to 0.1C accuracy, so cold bridges, missing insulation and air leakage show up clearly. The survey is non-invasive and non-destructive, which means we can map defects without lifting floors or opening walls.
Woking's housing mix gives us a wide range of thermal patterns to inspect. homedata.co.uk records show an overall average sold price of £446,000 in March 2026, provisional, with 852 sales in the 12 months to October 2025. Flats made up 240 of those sales, more than any other type, so we often see heat loss around window reveals, balcony junctions and service penetrations in apartment blocks as well as older houses.
240 sales
Flat Sales Count
Using listing data from home.co.uk and property data from homedata.co.uk
Thermal imaging is especially useful where a visual survey misses the clue. Our surveyors detect heat loss through roofs, external walls, floors and windows, then pinpoint missing or disturbed cavity insulation, loft gaps and cold bridging at lintels and joist ends. Air leakage shows up around door sets, trickle vents, extractor penetrations and poorly sealed rooflights. In colder weather, damp patches caused by moisture ingress usually appear as cooler zones because evaporation draws heat away from the surface.
The same scan can also expose defects inside the home. Underfloor heating faults appear as uneven hot and cold bands, and overheated electrical connections can show as localised hotspots that need further checking. In Woking town centre flats, we often see heat escaping around service risers and balcony junctions. In older terraces, chimney breasts, bay windows and loft hatches tend to stand out first.
Woking's sales profile makes thermal imaging relevant across almost every property type. homedata.co.uk records 852 sales in the 12 months to October 2025, split across 221 detached, 202 semi-detached, 189 terraced and 240 flats. That spread matters because a second-floor apartment in GU21 behaves differently from a detached house in GU23, even before insulation quality comes into the picture. Semi-detached homes also rose 1.4% over 12 months, while flats fell 3.1%, which tells us the internal fabric can have a bigger effect than many buyers expect.
New-build activity adds another layer. home.co.uk listings show Hollywood Quarter on Church Street East, Woking Town Centre, GU21 6HJ, with studio apartments, 1-bedroom flats and 2-bedroom apartments, while Allium Park in GU23 6HB offers 3, 4 and 5 bedroom houses and Abri Homes shared ownership options. Brookwood Lye Road Residential Scheme brings 58 homes with at least 50% affordable housing, and the former Cleary Court site at Chobham Road includes 463 co-living units plus 111 residential apartments. Those homes may look modern, yet thermal imaging still picks up missing seals, bridge points and gaps around service entries.
Many homes lose heat in repeatable places. Roof zones can account for around 25% of heat loss, walls 35% and windows 15%, so our thermal survey prioritises the parts of the fabric that matter most. We translate the imagery into practical fixes, from topping up loft insulation to sealing around penetrations and improving draught proofing at openings. That gives you a clearer route to lower heating demand rather than guessing.
The report also links findings to energy efficiency improvements that can support an EPC uplift. A small fix, such as a loft hatch seal or a missed insulation strip, may be cheap to correct, while larger upgrades like window replacement or cavity treatment need a longer view. We set out the likely benefit, the urgency of each defect and the order in which to tackle them, so you can judge where the money works hardest. If a measure is expensive, the thermal images still show whether it is justified.
Choose a Woking survey slot and tell us the property type, whether it is a flat in GU21 6HJ or a house in GU23, and any known cold spots.
We usually recommend October to March, because outside temperatures are low enough to give a strong thermal contrast.
Keep the heating on for at least 2 hours before we arrive, then close windows and external doors so the fabric settles.
Our surveyors carry out external and internal passes, checking walls, roofs, floors, openings, services and junctions with the camera.
We compare temperature patterns, rule out false readings from reflection or solar gain, and annotate every finding.
You receive a clear report with thermal images, explanations and recommendations you can act on straight away.
Thermal images use a colour scale rather than a photograph. Blue usually indicates a cooler surface, red a warmer one and white the hottest areas, although the scale is always read in context. A cold patch on a ceiling may point to missing insulation, while a colder band around a lintel can reveal a bridge in the fabric. In a town centre flat in GU21, the same colour shift can also reflect a balcony slab or service chase, so we never treat a single frame as the whole story.
False readings are easy to create if the conditions are poor. Solar gain can warm one elevation and hide defects, shiny surfaces can reflect nearby heat sources, and a room with the heating only just switched on may still be stabilising. That is why we ask for the heating to run for at least 2 hours and for the temperature difference to reach 10C or more between inside and outside. Better contrast means cleaner images and fewer guesses.
The local mix gives us repeat patterns. In newer schemes such as Hollywood Quarter or Allium Park, we often find thermal leakage around window frames, service penetrations and balcony junctions, because airtight construction depends on small details being finished properly. In apartment blocks, heat can also move through floor slabs and vertical risers, so one missed seal can affect several homes. The scan shows those paths clearly.
Older homes around Woking town centre, Horsell and the roads leading out towards Brookwood can show a different set of faults. Single-glazed windows, thin loft insulation, uninsulated loft hatches and gaps around chimney breasts tend to show up as cool zones, while partial retrofit work sometimes leaves tidy patches beside obvious losses. Where cavity insulation has been blown in or topped up, we can still see voids and cold streaks if the fill has settled. That is the kind of problem a visual inspection can miss, yet it has a direct effect on comfort and bills.
Thermal imaging can detect heat loss, missing or disturbed insulation, air leakage, cold bridging and moisture-related cooling patterns. It can also highlight underfloor heating faults and some electrical hotspots. Our surveyors use the camera to show where the building fabric is underperforming, then explain what each pattern means in plain English.
Thermal surveys in Woking start from £300. The final fee depends on the size of the property, how many elevations need scanning and how much analysis the report requires. You get external and internal infrared scans, plus an annotated report that shows the main problem areas.
October to March gives the best results because the temperature difference between inside and outside is easier to achieve. We aim for at least 10C of contrast, which helps the infrared camera separate genuine heat loss from background noise. Surveys can still be done at other times, but the images may be less clear.
Most surveys take 1-2 hours, depending on the property size and how many rooms we need to inspect. Larger homes, multi-flat blocks and buildings with limited access can take longer. The report usually follows after the images have been reviewed and annotated.
Yes, thermal imaging can help identify damp areas because moisture often appears cooler than the surrounding surface. It does not tell us the exact cause on its own, so our surveyors read the pattern alongside the building context. That helps separate condensation, moisture ingress and cold bridging.
Before we arrive, keep the heating on for at least 2 hours and close windows and external doors. Try to give access to loft hatches, cupboards and any spaces where service pipes or heating controls run. If you know about recent repairs, leaks or cold rooms, tell us in advance so we can focus on those areas.
No cutting, drilling or lifting is needed, so the survey is non-invasive and non-destructive. We scan surfaces from inside and outside, then interpret the temperature patterns without disturbing the building. That makes it a useful option for owners who want answers without opening up the property.
They do not replace a full building survey, because thermal imaging focuses on temperature patterns rather than structural condition. A standard survey still matters for movement, roofing, drainage and other visible defects. The two surveys work well together if you want both energy insight and a broader property check.
From £80
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Survey for standard homes and flats with visible defects
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Legal support for buyers who want a clean handover
Thermographic surveys in Woking start from £300. That fee covers external and internal infrared scans, review of the image set and an annotated report that explains where heat is escaping and why. Properties with more rooms, more elevations or difficult access can take longer, so the final price can move with size and complexity. For a home in GU21, GU22, GU23 or GU24, the cost is usually small compared with the value of catching a problem before the bills climb.
Most appointments take 1-2 hours depending on the property, and the written report follows after the images have been analysed. We recommend booking in the colder months, with the heating on for at least 2 hours beforehand and an inside-outside temperature difference of 10C or more. That gives our thermal imaging specialists the cleanest data, and it means the report can point to the parts of the building fabric that are losing energy right now.
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Infrared thermal imaging to detect heat loss and hidden defects
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Homemove is a trading name of HM Haus Group Ltd (Company No. 13873779, registered in England & Wales). Homemove Mortgages Ltd (Company No. 15947693) is an Appointed Representative of TMG Direct Limited, trading as TMG Mortgage Network, which is authorised and regulated by the Financial Conduct Authority (FRN 786245). Homemove Mortgages Ltd is entered on the FCA Register as an Appointed Representative (FRN 1022429). You can check registrations at NewRegister or by calling 0800 111 6768.
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